Trial-by-trial updating of an internal reference in discrimination tasks: Evidence from effects of stimulus order and trial sequence
Trial-by-trial updating of an internal reference in discrimination tasks: Evidence from effects of stimulus order and trial sequence
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DOI：
10.3758/s13414-012-0362-4
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发表时间：
2012-11-01
影响因子：
1.7
通讯作者：
Ulrich, Rolf
中科院分区：
文献类型：
--
作者：
Dyjas, Oliver;Bausenhart, Karin M.;Ulrich, Rolf
在心理物理学中，参与者经常被要求区分恒定标准和可变比较。先前的研究表明，当比较遵循而不是先于标准时，辨别的表现会更好。心理物理学和决策学的显著差异模型不能很容易地解释这种顺序效应。但是，这个模型类的一个简单扩展涉及内部引用的动态更新，可以解释这种顺序效应。此外，该内部参考模型（IRM）预测了序列反应效应。我们在两个持续时间区分实验中检验了IRM的预测。获得的结果与IRM的预测一致，表明参与者在每次试验中都会更新他们的内部参考。另外的模拟表明，IRM也解释了在单刺激范式中观察到的负序列效应。
In psychophysics, participants are often asked to discriminate between a constant standard and a variable comparison. Previous studies have shown that discrimination performance is better when the comparison follows, rather than precedes, the standard. Prominent difference models of psychophysics and decision making cannot easily explain this order effect. However, a simple extension of this model class involving dynamical updating of an internal reference accounts for this order effect. In addition, this Internal Reference Model (IRM) predicts sequential response effects. We examined the predictions of IRM in two duration discrimination experiments. The obtained results are in agreement with the predictions of IRM, suggesting that participants update their internal reference on every trial. Additional simulations show that IRM also accounts for the negative sequential effects observed in single-stimulus paradigms.